I bolted the rollbar attach points to the frame, beveling the outside edges and lubing it up pretty god and then fit the rollbar over it. It took a little work as I didn't notice the "B" & "C" tabs got held up on one side, but once I cleared that it slipped over the beautiful machined pieces nicely.
I clecoed the rollbars to the holes and it was tough fitting; I'm not sure how easy the rivets are going to go in there; we'll see.
